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- W165276645 abstract "Abstract. A new algorithm is proposed to incorporate orientation attributes at landmarks in an elastic medicalimage registration scheme. The approach is based on a minimizing functional and can cope with images ofarbitrary dimensions. Constraints due to orientations are incorporated through scalar products between thetransformed orientations in the sourceimageand vectorswhich are perpendicularto the orientations in the targetimage. For synthetic data sets we show that the structure of a rigid object in an otherwise elastically deformedimage can be preserved. The application of our approach to tomographic data sets shows that improvementsw.r.t. accuracy can be achieved provided a sufficient number of landmarks is well-distributed over the image. 1 Introduction Landmark-based elastic registration relies on the information associated with landmark points. To improve the re-sultsof landmark-based approaches whilemaintaining theirefficiency, work in thepast has been doneon includingadditional landmark attributes, like orientation. Especially in medical applications it is desirable to improve theregistration result without adding further landmarks.Bookstein and Green [1] incorporate orientationsby approximating them through two landmarks. Mardia et al. [2,3] use a kriging method to include derivative information. Their interpolation scheme yields an exact solution, butorientation vectors are required to be unit vectors. In this paper, we describe a new approach which i) is based on aminimizing functionaland ii) allowsto incorporateorientationattributes. As in the approach of Mardia et al. [2,3],exact orientations at landmarks are incorporated. However, in our case the directional constraints are representedthrough scalar products and therefore the lengths of the orientation vectors need not to be normalized to unitvectors. Another advantage of our approach is that it covers the full range from interpolation to approximationusing a regularization parameter" @default.
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- W165276645 date "1998-01-01" @default.
- W165276645 modified "2023-09-22" @default.
- W165276645 title "Elastic Medical Image Registration using Orientation Attributes at Landmarks" @default.
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